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Overview

codex-dsh-bridge connects Codex to a locally running DeepSeek Harness WebUI through its HTTP RPC API.

The repository contains both sides of the integration:

• a Codex plugin with MCP tools and a collaboration skill;
• a DeepSeek Harness companion that adds bridge controls to Harness settings.

Beginner one-click install

Requirements:

• Windows PowerShell 5.1 or PowerShell 7;
• Node.js 18 or newer;
• Codex CLI with plugin support;
• DeepSeek Harness with the dsh command available.

Download and run the installer:

$installer = Join-Path $env:TEMP "codex-dsh-bridge-install.ps1"
Invoke-WebRequest "https://raw.githubusercontent.com/knottttt/codex-dsh-bridge/main/install.ps1" -OutFile $installer
powershell -ExecutionPolicy Bypass -File $installer

The installer:

1. adds or refreshes the Codex marketplace;
2. installs the Codex plugin;
3. installs the Harness companion into the web profile;
4. prints the required restart steps.

After installation:

1. restart the DeepSeek Harness WebUI;
2. start a new Codex task;
3. open Settings → Plugins → Plugin configuration in Harness;
4. confirm that Codex DSH Bridge is enabled.

Manual installation

Run these commands if you prefer to review each action:

codex plugin marketplace add knottttt/codex-dsh-bridge --ref main
codex plugin add codex-dsh-bridge@codex-dsh-bridge
dsh plugin --profile web add github:knottttt/codex-dsh-bridge#main

Restart Harness and start a new Codex task after the commands finish.

Updating

Run the installer again. It refreshes the marketplace, reinstalls the Codex plugin, and updates the Harness package:

powershell -ExecutionPolicy Bypass -File $installer

Uninstalling

Download and run the uninstaller:

$uninstaller = Join-Path $env:TEMP "codex-dsh-bridge-uninstall.ps1"
Invoke-WebRequest "https://raw.githubusercontent.com/knottttt/codex-dsh-bridge/main/uninstall.ps1" -OutFile $uninstaller
powershell -ExecutionPolicy Bypass -File $uninstaller

Saved bridge settings are preserved by default. Pass -RemoveSettings to remove them as well.

Components

Component	Location	Purpose
Codex plugin	.codex-plugin/, .mcp.json	Registers the plugin and its local MCP server
MCP bridge	scripts/	Connects Codex tools to the DSH HTTP RPC API
Collaboration skill	skills/	Guides Codex when delegating work to DSH
Harness companion	dsh-plugin/	Adds bridge controls to Harness settings
Marketplace	.agents/plugins/marketplace.json	Makes the Codex plugin installable from GitHub
Installer	install.ps1	Installs and updates both sides of the bridge

Available Codex tools

• inspect the current DSH host;
• list and filter DSH sessions;
• create a session for a project;
• queue or steer a message;
• read clean user and final assistant messages;
• wait for bounded completion;
• cancel or fork a session;
• dispatch a task through one convenience tool.

Harness settings

The companion adds a configuration card at:

Settings → Plugins → Plugin configuration → Codex DSH Bridge

The card controls:

• whether the Codex bridge is enabled;
• which local Harness endpoint the bridge uses.

Settings are mirrored to:

%DSH_HOME%\codex-dsh-bridge.json

When DSH_HOME is unset, the fallback location is:

%USERPROFILE%\.dsh\codex-dsh-bridge.json

The MCP process reads this file for every tool call, so endpoint and enabled-state changes apply without restarting Codex. The optional DSH_BASE_URL environment variable overrides the saved endpoint, while the Harness enabled switch still takes priority.

Local-only security boundary

The bridge accepts only loopback HTTP origins with an explicit port:

• 127.0.0.1
• localhost
• ::1

HTTPS, LAN addresses, credentials, URL paths, query parameters, and fragments are rejected.

Troubleshooting

Codex tools do not appear

Start a new Codex task. Plugins and MCP tools are loaded when a task starts.

Harness settings card does not appear

Restart the Harness WebUI and verify the installed package:

dsh plugin --profile web list --depth 0

The list should contain codex-dsh-bridge-companion.

A required command is missing

Verify the commands independently:

node --version
codex --version
dsh --version

Install only one side

The installer supports:

.\install.ps1 -SkipDsh
.\install.ps1 -SkipCodex

Development

Run the complete test suite and package check from the repository root:

npm test
npm run pack:check

The suite covers bridge configuration, endpoint validation, Harness settings, revision conflicts, client registration, and distribution metadata.